It started happening about 6 months ago. The first thing in the morning there would be a noise from under the hood that sounded like a bad bearing. It’s not tied to the RPM of the engine so I suspect its probably an electric motor. After 30-60 seconds the sound stops and doesn’t happen again until the engine is cold again.
My first thought is that it might be a vacuum pump, possibly for the door locks, or something. Does this sound reasonable? What other type of electric motor would be under the hood? It doesn’t seem to be tied to anything else (wipers, radio, headlights, etc.)